EFFECT OF DIFFERENT CHEMICAL TREATMENTS ON WEEDS, YIELD OF SOFT WHEAT AND YIELD COMPONENTS

The chemical weed control of autumn cereals is a necessity to ensure good yield. In this study, we tested the effect of eight herbicide treatments on soft wheat yield Triticum aestivum and its components in INRA- Allal Tazi experimental station in the Gharb Region (Morocco) and this during the agricultural companion 2015-2016. The treatments used were in the form of single and combined herbicides. The inventory carried out in the station revealed that the adventitious flora is represented by 26 species belonging to 14 botanical families. Further, the majority are dicotyledons with 92.31% and therophytes with 88.46%. The results of our work showed that the all herbicide treatments significantly increased the grain yield and its component (number of wheat feet per m², number of wheat ears per m², biomass (stem+ ears), and weight of 1000 grains) compared to control. Concern the simple tratments the mesosulfuron methyl + iodosulfuron methyl was most effective against weeds. This treatment achieved the best grain yield with 50.8 qt/ha. Plots that have been treated with 2,4-D+ MCPA + Clodinafoppropargyl + pendimethaline (Pr+Tp+Pl) and the 2,4-D+MCPA+Clodinafop propargyl+ Prosulfocarbe (Pr+Tp+Bo) recorded the best yield that arrived at 52 qt/ha compared to other combined treatments.